Orthogonal geometry of wave interaction in a photorefractive crystal for linear phase demodulation

Girolamo, Salvatore Di; Romashko, Roman V.; Kulchin, Yuri N.; Kamshilin, Alexei A.

doi:10.1016/j.optcom.2009.09.035

Cited by 22 publications

(6 citation statements)

References 9 publications

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“…This type of interferometer allows maintaining high sensitivity and eliminating the influence of low-frequency mechanical vibrations, fluctuations of temperature or pressure and other noisy factors on the output signal. Complete description of the adaptive interferometer is given in the papers [38][39][40]. Multimode optical fibers with a core diameter of 62.5 m were used as sensitive elements of the interferometer.…”

Section: Application Of Distributed Fiber-optical Ae Sensors For Pcm Monitoringmentioning

confidence: 99%

Identification of Fatigue Damage Stages in Polymer Composite Materials by using Acoustic Emission: Approach and Perspectives

Bashkov¹,

Bryansky²,

Efimov³

et al. 2021

Preprint

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The work is devoted to the study of the mechanisms of damage accumulation in a polymer composite material (PCM) during fatigue loading. Mechanical testing of a fiberglass sample was carried out by cyclic tension accompanied by registration of acoustic emission (AE). For the recorded AE signals, the Fourier spectra were calculated and used for clustering with Kohonen self-organizing map. Relations between clusters and types of damage in the PCM structure were established. The analysis of the peak frequencies of the Daubechies D14-wavelet components of AE signals was carried out. Obtained results has allows one to describe the processes of destruction in the PCM sample. It has been established that, on the base of local formation of microdamages in the matrix and the fracture of the fibers detected during recording of the AE data, it is possible to predict the destruction of the polymer composite material, while the beginning of a material destruction can be registered if the damage identified as an adhesion failure is observed. Perspectives of application of adaptive fiber-optic AE sensors for structural monitoring of PCMs on the base of preliminary experimental results are considered and discussed.

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Section: Application Of Distributed Fiber-optical Ae Sensors For Pcm Monitoringmentioning

confidence: 99%

Identification of Fatigue Damage Stages in Polymer Composite Materials by using Acoustic Emission: Approach and Perspectives

Bashkov¹,

Bryansky²,

Efimov³

et al. 2021

Preprint

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“…in out-of-laboratory conditions which are characterized by accidental mechanical impacts, industrial noises, temperature or pressure drift etc. It is worth noting that the dynamic holograms are recorded in orthogonal geometry of vectorial two-wave mixing where all signal waves from optical fibers are directed to the photorefractive crystal orthogonally to the reference wave [27]. Such geometry provides independent operation of all the measuring channels of the adaptive interferometer, and excludes a crosstalk between the channels [28,29].…”

Section: The Receiver Architecturementioning

confidence: 99%

Fiber-optic vector acoustic receiver based on adaptive holographic interferometer

Romashko,

Storozhenko,

Bezruk

et al. 2021

Preprint

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A mobile scalar-vector acoustic receiver is proposed, experimentally implemented and investigated. The key components of the receiver are (i) the six-channel fiber-optic coil-type sensor configured as to detect three projections of acoustic intensity vector, (ii) the six-channel optical phase demodulator based on six-channel adaptive holographic interferometer configured with use of dynamic holograms multiplexed in a photorefractive crystal of cadmium telluride and (iii) the signals recording ADC-based system combined with software package for data processing. Field tests of the developed receiver applied for obtaining scalar and vector parameters of acoustic waves generated by a stationary and moving acoustic source in open air and water area are carried out. Experimental results show perceptiveness of use of the fiber-optical adaptive interferometry system for bearing of weak acoustic sources in real conditions.

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“…The cantilever out-of-plane mechanical vibrations were detected and their resonant frequency was measured by means of adaptive interferometer based on vectorial wave mixing in orthogonal geometry in CdTe crystal operated at cw laser light at 1,06 m [3].…”

mentioning

confidence: 99%

Resonance micromechanical mass sensor with holographic interferometer

Romashko

Efimov

Kulchin

2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Micromechanical resonators are widely used as inertial balances to detect small quantities of adsorbed mass through shifts in oscillation frequency [1]. In such applications, an interferometer is considered as a promising instrument for detecting the oscillations which could have ultra-small amplitude. However, due to its high sensitivity, an interferometer is open to an influence of external impacts such temperature drift, industrial noise, etc. Moreover classical homodyne interferometer is very sensitive to a quality of probe beam. Alternatively the interferometer can be implemented with use of dynamic holograms recorded in a photorefractive crystal [2]. Due to adaptive properties of dynamic holograms, such an interferometer can stably operate in industrial environment with light waves having complex wave fronts.In this work we present a prototype of the mass measurement system with pico-gram resolution based on micromechanical cantilever as a sensitive element and adaptive interferometry technique with using dynamic hologram recorded in photorefractive crystal for signal decoding.In the measurement system, laser light pulses at wavelength 532 nm with energy 0.5 mJ and duration 7 ns are used to excite a micro-mechanical cantilever with dimensions 200×40×5 m 3 . The cantilever out-of-plane mechanical vibrations were detected and their resonant frequency was measured by means of adaptive interferometer based on vectorial wave mixing in orthogonal geometry in CdTe crystal operated at cw laser light at 1,06 m [3].Organic nano-objects (with dimensions from 40 to 600 nm) were preliminary adsorbed at the end of cantilever by sputter coating technique. Masses of them were subject to a measurement. Every laser shot resulted in removing part of adsorbed microscopic objects (indicated by the arrows on Fig. 1). Figure 2 shows the evolution of the cantilever resonant frequency with laser pulse shots. As seen the frequency has increased by 751 Hz which corresponds to a decrease in the mass absorbed at the cantilever by 410×10 -12 g. The system has resolution of mass measurement was 6×10 -12 g.Adaptive properties of the interferometer based on using dynamic holograms allow one to drastically reduce size of cantilever (and, as sequence, to enhance a mass detection sensitivity) down to sub-wavelength scale without significant worsening of SNR. It is experimentally shown possibility of using cantilevers with dimensions 15×0,3×0,3 m 3 which opens prospects of easy detection of 10 -17 g masses. Fig.1. Cantilever with absorbed nano-objects before (a) and after (b) impact of laser pulses. Arrows show adsorbed nano-objects Fig.2. Micro-cantilever resonance frequency evolution with laser pulse shotsThe results obtained allow one to conclude that adaptive interferometer technique based on using dynamic photorefractive holograms can be a promising tool for detection ultra-small objects and measurement there masses. The research is supported by Ministry of Science and Education of Russian Federation.

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Orthogonal geometry of wave interaction in a photorefractive crystal for linear phase demodulation

Cited by 22 publications

References 9 publications

Identification of Fatigue Damage Stages in Polymer Composite Materials by using Acoustic Emission: Approach and Perspectives

Identification of Fatigue Damage Stages in Polymer Composite Materials by using Acoustic Emission: Approach and Perspectives

Fiber-optic vector acoustic receiver based on adaptive holographic interferometer

Resonance micromechanical mass sensor with holographic interferometer

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